What is corrugated plastic roofing?
Corrugated plastic roofing is a lightweight translucent panel made from polycarbonate, PVC, fiberglass (GRP), or polypropylene, pressed into a wavy or ribbed profile that stiffens the sheet and channels rainwater off it. A panel weighs a fraction of metal or fiber-cement, cuts with a fine-tooth circular saw blade or tin snips, and screws straight onto timber or metal purlins. Most buyers use it to cover a structure that needs light and shelter but not a full roof: a patio, carport, greenhouse, pergola, or shed.
The corrugation is what lets a thin plastic sheet act like a roof at all. A flat 0.8mm sheet sags between supports; the same sheet folded into ribs spans 24 inches or more without deflecting. That ribbed profile also has to line up with whatever sits next to it, which is where most buying mistakes happen. This guide sits alongside our wider material coverage in the Learn About Roofing hub.
Which plastic material should you pick?
Four plastics are sold as corrugated roofing, and they are not interchangeable. Polycarbonate is the most durable and the most expensive. PVC (vinyl) is the budget pick. Fiberglass (GRP) gives diffused light for workshops and agriculture. Polypropylene is a short-life utility sheet. The table below compares them on the four numbers that actually decide a purchase: light, lifespan, impact, and cost.
| Material | Light (clear grade) | UV life (typical) | Impact | Cost per sq ft (2026) | Best for |
|---|---|---|---|---|---|
| Polycarbonate | Up to ~90% | ~10 to 20 yrs, 10-yr anti-yellow warranty common | Very high (about 200x glass) | $1.50 to $3.00 | Patios, carports, hail and snow zones |
| PVC (vinyl) | ~70 to 90% (clear or opal) | ~5 to 10 yrs, yellows and stiffens sooner | Moderate | $0.70 to $1.50 | Budget patios, sheds, mild climates |
| Fiberglass (GRP) | ~50 to 75% (translucent) | ~10 to 15 yrs, surface fibers bloom without gelcoat | Moderate to high | $1.00 to $2.00 | Barns, workshops, diffused light |
| Polypropylene (PP) | Translucent | ~3 to 7 yrs, least UV stable | Low | $0.50 to $1.00 | Temporary or utility covers |
Polycarbonate is the sheet to buy where anything can hit it. It resists cracking down to about -40F and up to roughly 250F, and quality panels (Palram Suntuf is the common brand) carry a factory UV coat on the sun-facing side plus a limited warranty against yellowing. Install it coated-side up or the warranty means nothing.
PVC costs half as much and covers a shed or a low-value patio fine, but it grows brittle and cloudy faster in strong sun, so it fits mild climates better than high-UV states. Fiberglass spreads light evenly, which crops and workshop benches like, though older sheets shed glass fibers once the surface resin weathers. For a material-first breakdown of the two plastics buyers weigh most, see our guide to polycarbonate vs PVC plastic roofing sheets, and for light-transmission numbers across every clear option, our clear roof panel comparison.
Corrugated profiles, and matching them to your existing roof
The single most common failure is buying a plastic panel whose profile does not nest with the metal or plastic sheet already on the building. Corrugated is not one shape. Measure the crown-to-crown pitch and the rib depth of the existing roof first, then buy a plastic panel in the same profile so the ribs overlap cleanly and the seam stays watertight.
| Profile | Pitch (crown to crown) | Looks like | Common plastic panels |
|---|---|---|---|
| Round / sinusoidal (classic wavy) | ~2.67 in | Traditional wavy metal barn roof | Palram Suntuf, Tuftex Round, Palruf PVC |
| Greca / box (square rib) | ~varies by brand | Trapezoidal ribbed panel | Tuftex Deltarib, Suntop PVC |
| Industrial / 3-inch | ~3 in | Wide-pitch agricultural sheet | Vistamet, GRP farm sheeting |
If you are tying a translucent light strip into an existing metal roof, match the metal profile exactly. A sinusoidal Suntuf panel will not seal against a trapezoidal metal rib. Our guide to corrugated metal roofing covers how to identify the metal profile you already have, and our overview of corrugated roof panels across all materials shows how plastic, metal, and fiberglass profiles compare side by side.
Where corrugated plastic roofing works best
Corrugated plastic earns its place on structures that need daylight and rain cover rather than a sealed, insulated roof. It is not a house roof. It is a canopy material. These are the jobs it does well, roughly in order of how often homeowners buy it for them:
- Patios and pergolas: clear or opal polycarbonate keeps rain off while passing light onto the deck.
- Carports: impact-resistant polycarbonate shrugs off hail that dents metal.
- Greenhouses and grow tunnels: diffused fiberglass or opal polycarbonate spreads even light over plants.
- Sheds and workshops: a budget PVC or fiberglass sheet adds a daylight strip cheaply.
- Walkway and RV canopies: lightweight panels span rafters without heavy framing.
What it is not built for: any roof you walk on, any low pitch that ponds water, or any application below about a 5-degree slope. Plastic corrugate needs fall to shed water and is easily cracked underfoot, so treat it as a cover, not a deck.
How do you install corrugated plastic roofing?
Corrugated plastic installs onto purlins spaced roughly 24 inches on center (tighter, near 16 inches, for greenhouses or snow load). You fasten through the crown of the rib, never the valley, using screws with sealing washers, and you leave the sheet room to expand. Rushing the fastening is what cracks panels and lets leaks start. Work in this order:
- Set purlin spacing. Support the panel every 24 inches or as the manufacturer specs; reduce to 16 inches under snow or foot-traffic risk from cleaning.
- Pre-drill oversized holes. Drill fastener holes about 1/8 inch larger than the screw shank so the sheet can move as it heats and cools. Plastic expands far more than metal.
- Screw through the crown. Drive screws with EPDM-washered heads through the top of the rib, not the valley, so water never sits at a penetration.
- Do not overtighten. Snug the washer until it just seats. Crushing it star-cracks the panel around the hole.
- Lap the sides by one corrugation. Overlap adjoining sheets a full rib (1.5 ribs in high wind) on the downwind side.
- End-lap 6 to 8 inches. Where panels meet up-slope, overlap 6 to 8 inches and seal with the maker’s tape or lap sealant.
- Add foam closure strips. Fit profiled foam closures at the eave and ridge to block wind-driven rain, insects, and birds.
- Overhang the eave. Run the sheet 1.5 to 2 inches past the fascia into the gutter so runoff drops clean.
How much does corrugated plastic roofing cost?
Corrugated plastic roofing runs about $0.70 to $3.00 per square foot for the panel alone in 2026, driven mostly by material. A common 26-inch by 8-foot polycarbonate panel covering roughly 14 square feet costs about $30 to $45; the same size in PVC runs about $18 to $30. Fiberglass sits between them. Budget separately for fasteners, closure strips, and any flashing.
For a small patio of about 120 square feet, expect roughly $150 to $360 in polycarbonate panels, or $90 to $180 in PVC, before framing and screws. Closure strips and washered screws add $30 to $80. These are material-only ranges; regional pricing and store markups vary, and manufacturer-grade panels with longer UV warranties sit at the top of each band. Confirm current pricing at your supplier before you order.
Corrugated plastic vs corrugated metal and clear glazing
Corrugated plastic wins on light, weight, and hail resistance; corrugated metal wins on lifespan and fire rating. Plastic passes daylight and survives a hailstone that would dent steel, but a metal panel may last 40 years to plastic’s 10 to 20. Choose plastic when you want light through the roof and a low weight; choose metal when you want the longest service life over a solid structure.
Against glass or twin-wall polycarbonate glazing, corrugated plastic is cheaper and lighter but less insulating and less clear. For a pergola or carport that only needs rain cover and daylight, single-skin corrugate is the practical pick. For a heated sunroom, twin-wall or glass earns its cost. This page targets the corrugated-profile plastic buyer specifically; our material and light-transmission guides linked above cover the flat and clear options in full.
Frequently asked questions
What is corrugated plastic roofing made of?
Corrugated plastic roofing is made from one of four plastics: polycarbonate, PVC (vinyl), fiberglass-reinforced plastic (GRP), or polypropylene. Each is extruded or pressed into a wavy or ribbed profile for stiffness. Polycarbonate is the most impact-resistant and longest-lived, PVC the cheapest, and fiberglass the best at spreading diffused light for greenhouses and workshops.
How long does corrugated plastic roofing last?
Lifespan depends on the plastic and the sun. Quality polycarbonate typically lasts 10 to 20 years and often carries a 10-year warranty against yellowing. PVC usually runs 5 to 10 years before it clouds and stiffens. Fiberglass lasts 10 to 15 years, and polypropylene 3 to 7. Strong UV exposure shortens every one of these ranges.
Do you screw corrugated plastic roofing on the ridge or the valley?
Screw through the crown (the top of the rib), never the valley. Fastening at the high point keeps water away from the penetration and stops it pooling at the hole. Use screws with EPDM sealing washers, pre-drill holes about 1/8 inch oversize so the sheet can expand, and stop tightening as soon as the washer seats to avoid cracking the panel.
Can you walk on corrugated plastic roofing?
No. Single-skin corrugated plastic is not walkable and will crack under body weight, especially older or cold panels. To clean or install it, work from a ladder or lay a scaffold board or crawl board across the purlins to spread your weight onto the framing, never onto the sheet itself. Falls through fragile roof lights are a recognized roofing hazard.
What is the best corrugated plastic roofing for a greenhouse?
For a greenhouse, opal or diffusing polycarbonate and fiberglass both work well because they scatter light evenly and reduce hot spots and leaf scorch. Clear polycarbonate passes the most light but casts sharper shadows. Polycarbonate adds better impact resistance and a longer UV warranty, while fiberglass costs less and gives a softer, diffused light many growers prefer.
How much does corrugated plastic roofing cost per sheet?
A standard 26-inch by 8-foot panel, covering about 14 square feet, costs roughly $30 to $45 in polycarbonate and $18 to $30 in PVC in 2026. That equals about $0.70 to $3.00 per square foot depending on material and grade. Add fasteners, foam closure strips, and flashing, and confirm current pricing with your local supplier before ordering.
Reviewed by The Roofing Brief Team. Last reviewed July 2026.